Apparatus for making an adaptor which is used in heating and ventilation systems

ABSTRACT

Apparatus ( 120 ) for making an adaptor ( 2 ) which is used in heating and ventilation systems and which is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape, which apparatus ( 120 ) comprises:
         (i) a work area ( 24 ) for receiving sheet metal ( 127 ) to be made into the adaptor ( 2 );   (ii) a creasing member ( 28 ) which is for creasing the sheet metal ( 127 ) on the work area ( 24 );   (iii) a pivot member ( 122 ) about which the sheet metal ( 127 ) is pivoted on the work area such that the creasing member ( 28 ) is able to make a plurality of creases ( 146 ) which are in the sheet metal ( 127 ) and which extend from the pivot member ( 122 ) in order to produce a transition part of the adaptor ( 2 ) which is positioned between a first end of the adaptor ( 2 ) which is of the square cross sectional shape and a second end of the adaptor ( 2 ) which is of the circular cross sectional shape;   (iv) operator means ( 32 ) for causing the creasing member ( 28 ) to operate and crease the sheet metal ( 127 );   and which apparatus ( 120 ) is characterised in that:   (v) the pivot member ( 122 ) comprises a plate portion ( 124 ) which locates in use in a V-shaped slot ( 126 ) in the sheet metal ( 127 ), and a shank portion ( 128 ) which mounts the plate portion ( 124 ) on the apparatus ( 120 ); and   (vi) the plate portion ( 124 ) is pivotable with respect to the work area ( 24 ) to enable the sheet metal ( 127 ) to pivot on the work area ( 24 ). (FIG.  16 )

This invention relates to apparatus for making an adaptor which is used in heating and ventilation systems. More especially, this invention relates to apparatus for making an adaptor which is used in heating and ventilation systems and which is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape.

In the heating and ventilation industry, it is preferred to use ducting which is of a circular cross sectional shape rather than ducting which is of a square cross sectional shape. This is because the ducting which is of the circular cross sectional shape is cheaper to manufacture than the ducting which is of the square cross sectional shape. It is common practice in the heating and ventilation industry to use ducting which is of a square cross sectional shape in situations which demand the use of such ducting, and then to connect to ducting which is of a circular cross sectional shape as soon as possible.

In the heating and ventilation industry, the ducting which is of the square cross sectional shape is connected to the ducting which is of a circular cross sectional shape by an adaptor. The adaptor is often known as a square-to-round adaptor. The adaptor is made on a folding machine. The folding machine was in fact made for other purposes and it is awkward and time consuming to produce the adaptor on the folding machine. With the known adaptors that are produced on the folding machine, it is necessary to produce them in two halves, which are then welded together.

Known apparatus which obviates or reduces the above mentioned problem is as shown in GB 2494678. In GB 2494678 there is shown apparatus for making an adaptor which is used in heating and ventilation systems and which is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape, which apparatus comprises:

-   -   (i) a work area for receiving sheet metal to be made into the         adaptor;     -   (ii) a creasing member which is for creasing the sheet metal on         the work area;     -   (iii) a pivot member about which the sheet metal is pivoted on         the work area such that the creasing member is able to make a         plurality of creases which are in the sheet metal and which         extend from the pivot member in order to produce a transition         part of the adaptor which is positioned between a first end of         the adaptor which is of the square cross sectional shape and a         second end of the adaptor which is of the circular cross         sectional shape; and     -   (iv) operator means for causing the creasing member to operate         and crease the sheet metal.

The apparatus as shown in GB 2494678 is advantageous in that it is able to make the adaptors faster than with the folding machine. This is because the apparatus has the operator means for causing the creasing member to pivot with respect to the work area and crease the sheet metal. This leaves an operator of the apparatus with both hands free to manipulate the sheet metal about the pivot member to desired positions with respect to the pivot member for being provided with the creases that are required to produce the transition part of the adaptor. The apparatus is also advantageous in that it is able to make the adaptor in two halves which are welded together as with the known folding machine, or alternatively in one piece, which is a facility not available with the known folding machine.

The apparatus as shown in GB 2494678 requires that the sheet metal be provided with a hole to receive the pivot member, which is preferably a pivot pin. The provision of the hole requires a separate operation. It would be an advantage if this separate operation could be avoided. This is especially so if the hole is punched into the apparatus by hand because it not only avoids loss of time but it also helps to avoid operator fatigue.

Also, when the pivot member is located in the hole in the sheet member, the pivot member is of a cross sectional size which prevents the creases formed in the sheet metal converging closely together. The creases in the sheet metal are only able to converge to an extent defined by the cross sectional size of the pivot member. It would be an advantage if the creases in the sheet metal could converge together more closely, thereby improving the appearance of the formed adaptor.

It is an aim of the present invention to provide the above mentioned advantages.

Accordingly, in one non-limiting embodiment of the present invention, there is provided apparatus for making an adaptor which is used in heating and ventilation systems and which is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape, which apparatus comprises:

-   -   (i) a work area, for receiving sheet metal to be made into the         adaptor;     -   (ii) a creasing member which is for creasing the sheet metal on         the work area;     -   (iii) a pivot member about which the sheet metal, is pivoted on         the work area such that the creasing member is able to make a         plurality of creases which are in the sheet metal and which         extend from the pivot member in order to produce a transition         part of the adaptor which is positioned between a first end of         the adaptor which is of the square cross sectional shape and a         second end of the adaptor which is of the circular cross         sectional shape; and     -   (iv) operator means for causing the creasing member to operate         and crease the sheet metal;     -   and which apparatus is characterised in that:     -   (v) the pivot member comprises a plate portion which locates in         use in a V-shaped slot in the sheet metal, and a shank portion         which mounts the plate portion on the apparatus; and     -   (vi) the plate portion is pivotable with respect to the work         area to enable the sheet metal to pivot on the work area.

With the apparatus of the present invention, the sheet metal is able to be located on the plate portion of the pivot member and there is no need to provide the sheet member with a hole for receiving a pivot member. Also, the creases formed in the sheet member are able to converge closely together because the plate portion is able to be considerably narrower than a pivot member.

The apparatus of the present invention may be one in which the plate portion is fixed to the shank portion, and in which the shank portion pivots in a recess in the apparatus. Alternatively, the apparatus may be one in which the shank portion is fixed to the apparatus, and in which the plate portion pivots about the shank portion.

The apparatus may be one in which the creasing member has an offset blade. The offset blade allows the adapter to be formed with a pattern of creases at a right angle to the square end of the adaptor.

The apparatus may be one in which the creasing member comprises an upper brace for preventing the flexing of the creasing member when making the creases. The use of the upper brace is advantageous when the creasing member is of a long length.

The apparatus may be one in which the creasing member comprises a creasing blade, and in which the creasing blade is removable from the remainder of the creasing member so that the creasing blade is replaceable when it becomes worn. Other types of creasing member may be employed, including creasing members with fixed creasing blades.

The apparatus may be one in which the work area includes a bed.

The apparatus may be one in which the bed comprises two bed parts, in which the two bed parts form opposite sides of the bed, and in which the two bed parts are removable bed parts so that they are replaceable when they become worn.

When the apparatus includes an offset blade, then the apparatus may be one in which the bed is offset to line up with the offset blade.

The apparatus may comprise a frame which is constructed to allow flat packaging for transportation, and self-assembly on site. Other types of frame may be employed so that, for example, the frame may be a fixed frame.

The apparatus of the present invention may be one in which the creasing member is pivotally mounted with respect to the work area, and in which the operator means causes the creasing member to operate such that the creasing member pivots with respect to the work area. Other types of creasing member may be employed, and other types of movement of the creasing member may be employed.

The apparatus of the present invention may include depth adjuster means for adjusting the amount of movement of the creasing member and thereby the depth of the creases made in the sheet metal. The depth adjuster means may comprise a screw bolt. Other types of depth adjuster means may be employed.

The apparatus of the present invention may be one in which the work area has a receiving formation for receiving the creasing member as the creasing member creases the sheet metal. The receiving formation may be a groove. The groove is preferably a V-groove. Other types of receiving formation may be employed, for example a slot.

The creasing member may comprise a creasing blade. The creasing blade may extend at right angles to a body part of the creasing member. Other constructions for the creasing member may be employed.

Preferably, the operator means is a foot-operated operator means. The foot-operated operator means is preferably a pneumatic foot-operated operator means. Generally, the operator means may be operator powered, pneumatically powered, hydraulically powered or electrically powered. The operator means may be a cam-operated operator means.

The apparatus of the present invention may include a stand on which the work area is mounted. The stand may be of various shapes. The operator means may be mounted to the stand.

The stand may comprise a base and an upstanding formation which upstands from the base and which supports the work area. The base may comprise a pair of legs which define a T-shape or a cross. Other constructions for the base may be employed. The upstanding formation may be a post. Other constructions for the upstanding formation may be employed.

The apparatus of the present invention may include safety locking means for preventing unwanted operation of the creasing member. The safety locking means may be a locking pin which extends into a hole in the creasing member. Other types of safety locking means may be employed.

When the safety locking means is a locking pin, then the apparatus may be one in which the locking pin is spring biased to a position in which the locking pin is engaged in the hole in the creasing member, and in which the locking pin is holdable by holding means in a non-engaged position for operation of the creasing member. The holding means may be a rotatable pin arrangement. Other types of holding means may be employed.

The apparatus of the present invention may include clamping means for clamping the pivot member. The clamping means may comprise a cam and a lever which operates the cam. Other types of clamping means may be employed.

The apparatus of the present invention may be made of any suitable and appropriate materials. The stand in the form of the base and also the upstanding formation may be made of box section. The sheet metal will usually be galvanised sheet metal but other metals may be employed.

The apparatus of the present invention may include a guard for the creasing blade. The guard may act to avoid an operator trapping their fingers under the creasing blade. The guard may be especially useful when the foot-operated operator means is powered pneumatically or hydraulically, but it may also be useful when the foot-operated operator means is powered by the operator. The guard may be of a plastics material, for example perspex. Advantageously, the plastics material such for example as the perspex, is transparent so that an operator can see through the guard to work on the sheet metal to form the adaptor. The guard may be in the form of a sleeve or a cover for the creasing blade.

Embodiments of the invention will now be described solely by way of example and with reference to the accompanying drawings in which:

FIGS. 1-4 show four different types of known adaptor;

FIG. 5 is a perspective view from above and one side of first known apparatus and as shown in GB 2494678;

FIG. 6 is a perspective view from above and the other side of the apparatus shown in FIG. 5;

FIG. 7 shows the apparatus of FIG. 5 in use;

FIG. 8 shows in more detail a work area, a creasing member, and a pivot member, all forming part of the apparatus shown in FIG. 5;

FIG. 9 shows in more detail a foot-operated operator means, which forms of the apparatus shown in FIG. 5;

FIG. 10 is a side view of second apparatus as shown in GB 2494678, and shows in more detail the construction of the creasing member, and also the construction of safety locking means;

FIG. 11 is an end view of the apparatus shown in FIG. 10 and shows in cross section the creasing member and a groove into which the creasing member presses the sheet metal in order to crease it;

FIG. 12 shows third apparatus as shown in GB 2494678, and with optional clamping means for clamping the pivot member;

FIG. 13 is a sectional view of fourth apparatus as shown in GB 2494678;

FIG. 14 is an end view of the creasing member used in the apparatus shown in FIG. 13;

FIG. 15 shows the sheet metal in initial form as it is used on the apparatus as shown in GB 2494678;

FIG. 16 shows first apparatus of the present invention;

FIG. 17 is an exploded detail view showing the pivot member used in the apparatus shown in FIG. 16;

FIGS. 18 and 19 are end and top views of the pivot member as shown in GB 2494678;

FIGS. 20, 21 and 22 are front, top and side views of the pivot member employed in the apparatus shown in FIG. 16;

FIG. 23 is a perspective view of second apparatus of the present invention;

FIG. 24 is a side view of the apparatus shown in FIG. 23;

FIG. 25 is a top plan view of the apparatus shown in FIG. 23;

FIG. 26 is an end view of the apparatus shown in FIG. 23;

FIG. 27 is a section on line A-A shown in FIG. 24;

FIG. 28 is an enlarged detail of the part in the circle B shown in FIG. 24;

FIG. 29 is an enlarged detail of the part in the circle C shown in FIG. 24;

FIG. 30 is an enlarged perspective view of the apparatus as shown in FIG. 23;

FIG. 31 shows in detail the part in the circle D shown in FIG. 30;

FIG. 32 shows in detail the part in the circle E shown in FIG. 30;

FIG. 33 illustrates the creasing of sheet metal to form the adaptor;

FIGS. 34-39 illustrate different steps in the forming of the sheet metal into the adaptor; and

FIG. 40 is a side view of third apparatus of the present invention.

Referring to FIG. 1 of the drawings, there is shown a known adaptor 2 which is used in heating and ventilation systems. More specifically, the adaptor 2 is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape. The adaptor 2 comprises a first end 4 which is of a square cross sectional shape, and a second end 6 which is of a circular cross sectional shape. The adaptor 2 comprises a transition part 8 which is positioned between the first end 4 and the second end 6. The transition part 8 comprises a plurality of creases 10 which enable the transition between the square cross sectional shape and the circular cross sectional shape.

FIGS. 2, 3 and 4 show adaptors 12, 14, 16 respectively. Similar parts as in the adaptor 2 have been given the same reference numerals for ease of comparison and understanding. The adaptors 12, 14, 16 have different sizes of second end 6. Also, the adaptors 2, 12, 14 are straight in-line adaptors, whereas the adaptor 16 is an offset adaptor which is offset by the distance 20.

Referring now to FIG. 5-9, there is shown apparatus 22 for making the adaptor 2. The apparatus 22 can also be used for making other adaptors such for example as the adaptors 12, 14, 16. The apparatus 22 comprises:

-   -   (i) a work area 24 for receiving sheet metal 26 to be made into         the adaptor 2;     -   (ii) a creasing member 28 which is for creasing the sheet metal         26 on the work area 24;     -   (iii) a pivot member 30 about which the sheet metal 26 is         pivoted on the work area 24 such that the creasing member 28 is         able to make a plurality of creases 10 which are in the sheet         metal 26 and which extend radially from the pivot member 30 in         order to produce the transition part 8 of the adaptor 2; and     -   (iv) operator means 32 for causing the creasing member 28 to         operate and crease the sheet metal 26.

The apparatus 22 is one in which the creasing member 28 is pivotally mounted with respect to the work area 24. More specifically, the creasing member 28 is pivotally mounted about a pivot 34. The apparatus 22 is also such that the operator means 32 is a foot-operated operator means 32 which causes the creasing member 28 to operate such that the creasing member 28 pivots about the pivot 34 and with respect to the work area 24.

The work area 24 has a receiving formation 38 for receiving the creasing member 28 as the creasing member 28 creases the sheet metal 26. The creasing formation 38 is in the form of a groove. As can be seen from FIGS. 6, 8 and 9, the receiving formation 38 has sloping sides 40, 42.

The creasing member 28 comprises a creasing blade 44. The creasing blade 44 extends at a right angle to a body part 46 of the creasing member 28.

The pivot member 30 is a pin member which is of circular cross section and which upstands from the work area.

The foot-operated operator means 32 is powered by the operator via a foot pedal 48 and a connecting linkage in the form of a connecting rod 50. The connecting rod 50 is pivotally connected to an end 52 of the creasing member 28 by a pivot 54. The end 52 is an end of the creasing member 28 remote from the pivotal mounting of the creasing member 28 by the pivot 34.

The apparatus 22 includes a stand 56 on which the work area 24 is mounted. The foot-operated operator means 32 is pivotally mounted by a pivot 58 about the stand 56. The foot-operated operator means 32 is spring biased to a rest position by a coil spring 60 which extends between the foot-operated operator means 32 and the stand 56.

The stand 56 comprises a base 62 and an upstanding formation 64 which upstands from the base 62 and which supports the work area 24. The base 62 comprises legs 66 which define a cross. The upstanding formation 64 is in the form of a post. The upstanding formation 64 and the legs 66 are made of angle iron.

Referring now to FIGS. 10 and 11, there is shown second apparatus 68 which is like the first apparatus 22. Similar parts as in the first apparatus 22 have been given the same reference numerals for ease of comparison and understanding.

The second apparatus 68 is such that it includes depth adjuster means 70 for adjusting the amount of movement of the creasing member 28 into the receiving formation 38. This thereby controls the depth of the creases 10 made in the sheet metal 26. The depth adjuster means 70 comprises a screw bolt 72 which screws into a screw threaded recess 74 in the upstanding formation 64.

The second apparatus 68 also comprises safety locking means 76 for preventing unwanted operation of the creasing member 28. The safety locking means 76 comprises a locking pin 78 which is spring biased by a spring 80 to a position in which the locking pin 78 is engaged in a hole 82 in the creasing member 28. The locking pin 78 is holdable by holding means 84 in a non-engaged position for operation of the creasing member 28. The holding means 84 comprises a rotatable pin arrangement having a pair of pins 86 which engage or disengage from slots (not shown) for permitting operation and non-operation of the holding means 84.

FIG. 12 shows third apparatus 88. Similar parts as in the first apparatus 2 and the second apparatus 58 have been given the same reference numerals for ease of comparison and understanding. The third apparatus 88 comprises clamping means 90 for clamping the pivot member into the sheet metal 26. The clamping means 90 comprises a cam 92 and a lever 94 which operationally rotates the cam 92 so that it is able to bear as shown via a spring 96 onto the pivot member 30.

Referring now to FIGS. 13 and 14, there is shown fourth apparatus 100. Similar parts as in previous apparatus have been given the same reference numerals for ease of comparison and understanding. In the fourth apparatus 100, there is a creasing member 102 which is different from the creasing member 28. The creasing member 102 comprises a plurality of longitudinally extending teeth 104 which extend as ridges along the length of the creasing member 102. The teeth 104 engage sheet metal 127 and press it into a space 108 between two rollers 110, 112. In use of the apparatus 100, the operator firstly uses two hands to position the sheet metal 127 at the pivot. The operator then rotates the creasing member 102 by means of a handle 114. As the creasing member 102 rotates, the teeth 104 crease the sheet metal 127. The sheet metal 127 gets pulled through the creasing member 102 as the creasing member 102 rotates. The sheet metal 127 skids with respect to the creasing member 102 at the pivot end of the sheet metal 127. In an alternative embodiment (not shown), the creasing member may be shaped like a cone rather than being parallel sided. The cone shape may be effective to produce the creases without the skidding of the sheet metal with respect to the creasing member.

Referring now to FIG. 15, there is shown sheet metal 127 showing how it may be cut to shape with notches 118 to receive in turn the pivot member 30 in order to provide the creases 10 in order to go from the flat formation shown in FIG. 15 to a three dimensional adaptor formation.

Referring now to FIGS. 16 and 17, there is shown apparatus 120 of the present invention.

The apparatus 120 is such that it has a pivot member 122 which is different from the pivot member 30. More specifically, the pivot member 122 comprises a plate portion 124 which locates in use in a V-shaped slot 126 in the sheet metal 127 shown in FIG. 34.

The pivot member 26 also comprises a shank portion 128 which is pivotable with respect to the work area 24 to enable the sheet metal 127 to pivot on the work area 24. The plate portion 124 is fixed to the shank portion 128. The shank portion 128 pivots in a recess 130 in the apparatus 120. In an alternative embodiment of the invention not shown, the shank portion 128 may be fixed to the apparatus 120, and the plate portion 124 may pivot about the shank portion 128.

As can best be seen from FIG. 17, the apparatus 120 has a creasing member 132 which has an offset blade 134. The offset blade 134 enables an adapter to be formed such that there is a right angle at the square end of the adaptor.

The offset blade 134 is a creasing blade. The offset blade 134 is removable from the remainder of the creasing member 132 so that the offset blade 134 is replaceable when it becomes worn.

The apparatus 120 includes a bed 136. The bed 136 is a V-shaped bed.

The bed 136 comprises two bed parts 138, 140. The two bed parts 138, 140 form opposite sides of the bed 136. The two bed parts 138, 140 are removable bed parts so that they are replaceable when they become worn.

The bed 136 is offset to line up with the offset blade 134.

FIG. 16 shows how the creasing member 132 may optionally be provided with an upper brace 142 for preventing flexing of the creasing member 132 when making the creases in the sheet metal 127. The upper brace 142 is advantageous when the creasing member 132 is long. The upper brace 142 is a bowed upper brace 142 as shown.

FIGS. 18 and 19 shown the apparatus 22 of FIG. 5 and these Figures may be compared with FIGS. 20, 21 and 22 showing comparable parts of the apparatus 120. In the apparatus 22, it wily be seen that the pivot member 30 is a pivot pin of circular cross section. The sheet metal 127 has to be provided with a hole 144 in order to receive the pivot member 122. The hole 144 is punched and this may be done by hand or by machine. The punching of the hole 144 is time consuming, and it may be tiring to an operator if done by hand. This is avoided with the apparatus of the present invention, as can be appreciated from the sheet metal 127 shown in FIGS. 21 and 34.

In addition, as can be appreciated from FIG. 19, the location of the pivot member 30 in the sheet metal 26 prevents the creases 146 from converging together as closely as would be desirable. This is due to the fact that the pivot member 30 has an appreciable cross sectional area and therefore the creases 146 can only diverge to the extent defined by the hole 144 which receives the pivot member 30. In contrast, the pivot member 122 is such that the plate portion 124 is able to locate at the base of the V-shaped slot 126 in the sheet metal 127. There is no need to provide, the hole 144. Also, as can be appreciated from FIG. 21, the plate portion 122 is much thinner in cross section than the pivot member 30. This means that the creases 146 can converge substantially to a point 148, which makes the finished adaptor produced from the sheet metal 127 look neater.

In further embodiments of the invention, the apparatus shown in FIGS. 5-14 can be modified to replace the illustrated pivot members with the pivot member 122, thereby to become apparatus of the present invention.

FIGS. 23-32 show apparatus 150 of the present invention. The apparatus 150 includes a pivot member 152 which has a plate portion 154 and a shank portion 156.

The apparatus 150 has the base section 158 which defines a T-shape.

The apparatus 150 is such that it has a creasing member 160 with an offset blade 162 which allows the sheet metal 127 to be formed at a right angle at the square end of the formed adaptor. The apparatus 150 has a bed 164 which is also offset to that it lines up with the offset blade 162. The bed 164 is deep enough to allow free travel of the sheet metal 127 as it is creased at the square end of the adapter being formed. The length of the bed 164 in the apparatus 150 is 750 mm to accommodate large sheets of the sheet metal 127. The length of the bed may be longer or shorter as may be desired.

The apparatus 150 has an air switch 166, which replaces the manual foot lever 48. The apparatus 150 is pneumatically operated apparatus which contains a pneumatically operating device 168.

The apparatus 150 has a frame 170 that is able to be packed flat for transportation and that is able to be self-assembled on site.

The apparatus 150 is such that the blade 162 has a top bow brace 172 to stop any flexible of the blade 162 when creasing the sheet metal 127.

Guide marks 174 have been added to the length of the bed 164 to give distances to where the sheet metal 127 should be moved when making the creases.

The apparatus 150 has a blade depth adjuster 176 which has now been made to pass through a blade guide 178 to stop fingers of an operator getting pinched. The blade 162 is separable from an upper arm part of the creasing member 160 so that the blade 162 can be replaced when it becomes worn. The apparatus 150 has a bed 136 with the two replaceable bed parts 138, 140.

The apparatus 150 has clevises 163 at either end of the blade 162. The blade 162 operates on the clevises 163. At the cylinder end of the clevis in the top arm, there is an oval slot to allow the direction of the cylinder not to curve in operation.

The bed 164 may be such that it has bed angles which are each at 15 degree to make up a V-shaped bed angle of 30 degrees.

A safety guard 182 is in two separate parts. The safety guard 182 is attached to the blade 164. The safety guard 182 has slots held by pins that, when in operation, are able to maintain a 6 mm gap so as to stop the blade 162 creasing an operator's fingers. The 6 mm gap may be larger or smaller if desired.

The apparatus 22, 68, 88 is able to be operated by the foot-operated operator means 32, whereby an operator 98 is able to use two hands to hole and manipulate the sheet metal 127 in order to crease it as required to produce the required adaptor. Thus the apparatus 22, 68, 88 is faster to work with than the known folding machine, and thus the apparatus 22, 68, 88 is able to produce adaptors faster and easier than with the known folding machine. Also, the apparatus 22, 68, 88, 100 is able to produce adaptors in two parts for welding together, or if desired in one single part. With the known folding machine, it is only possible to produce the adaptors in two parts which need to be welded together.

Referring now to FIGS. 33-39, there are shown different states in the formation of the sheet metal 127 into the adaptor 2. More specifically, FIG. 33 shows the ceasing of the apparatus to form the adaptor. FIG. 34 shows an initial flat plate shape. FIGS. 35-37 show the flat plate shape of FIG. 34 being provided with one and more creases to provide the required change into the bent shape of the adaptor 2. FIGS. 38 and 39 are different views of the final shape for the adaptor 2.

FIG. 40 shows third apparatus 184 of the present invention. Similar parts as in previous Figures have been given the same reference numbers for ease of comparison and understanding. The apparatus 184 has an upper portion 186 which may be the same as in any of the above Figures showing the apparatus of the present invention. As shown in FIG. 40, the upper portion 186 is mounted on two legs 188, 190. The leg 188 is a telescopic leg having two telescoping parts 192, 194. The leg 188 has an upper pivot 196 and a lower pivot 198. The leg 190 has two parts 100, 102. The leg 190 has an upper fixed connection 104 and a lower fixed connection 106. The two parts 100, 102 are able to pivot about a pivot 108. The leg 188 pivots as shown, and the leg 190 folds as shown. This enables the upper portion 186 to be angled to a desired angle as shown. Thus the working angle of the upper portion 186 of the apparatus 184 can be adjusted to suit each individual person operating the apparatus 184. There is no need for the person constantly to have to bend over and reach out, for example as may be the case when working on short patterns. The height of the leg 188 is adjustable by a pin 110 locating in an appropriate one of a series of holes 112. The leg 190 can be made vertical by locating a bolt or pin (not shown) in a hole 114. In the vertical position of the leg 190, the leg 188 will also be adjusted to the vertical, and the upper portion 186 will be horizontal.

It is to be appreciated that the embodiments of the invention described above with reference to the accompanying drawings have been given by way of example only and that modifications may be effected. Thus, for example, the apparatus of the present invention may have a different type of work area than the work area 24, a different type of creasing member than the creasing member 28 or 102, a different type of foot-operated operator means than the foot-operated operator means 32, and a different type of base than the base 62. For example, the base 62 may be a flat plate rather than the legs 66. Referring to FIG. 30, the stand parts 151, 153 are preferably made from folded laser cut profiles which are bolted together on assembly. The stand parts 151, 153 may be made in other ways if desired. A stiffening leg 155 may optionally be provided. The bed 136 preferably has a drop section 137 but this section need not be dropped. Individual components shown in the drawings are not limited to use in their drawings and they may be used in other drawings and in all aspects of the invention. 

1. Apparatus for making an adaptor which is used in heating and ventilation systems and which is used to connect ducting which is of a square cross sectional shape to ducting which is of a circular cross sectional shape, which apparatus comprises: (i) a work area for receiving sheet metal to be made into the adaptor; (ii) a creasing member which is for creasing the sheet metal on the work area; (iii) a pivot member about which the sheet metal is pivoted on the work area such that the creasing member is able to make a plurality of creases which are in the sheet metal and which extend from the pivot member in order to produce a transition part of the adaptor which is positioned between a first end of the adaptor which is of the square cross sectional shape and a second end of the adaptor which is of the circular cross sectional shape; and (iv) operator means for causing the creasing member to operate and crease the sheet metal; and which apparatus is characterised in that: (v) the pivot member comprises a plate portion which locates in use in a V-shaped slot in the sheet metal, and a shank portion which mounts the plate portion on the apparatus; and (vi) the plate portion is pivotable with respect to the work area to enable the sheet metal to pivot on the work area.
 2. Apparatus according to claim 1 in which the plate portion is fixed to the shank portion, and in which the shank portion pivots in a recess in the apparatus.
 3. Apparatus according to claim 1 in which the shank portion is fixed to the apparatus, and in which the plate portion pivots about the shank portion.
 4. Apparatus according to claim 1 in which the creasing member has an offset blade.
 5. Apparatus according to claim 1 in which the creasing member comprises an upper brace for preventing flexing of the creasing member when making the creases.
 6. Apparatus according to claim 1 in which the creasing member comprises a creasing blade, and in which the creasing blade is removable from the remainder of the creasing member so that the creasing blade is replaceable when it becomes worn.
 7. Apparatus according to claim 1 in which the work area includes a bed, in which the bed comprises two bed parts, in which the two bed parts form opposite sides of the bed, and in which the two bed parts are removable bed parts so that they are replaceable when they become worn. 8.-9. (canceled)
 10. Apparatus according to claim 1 and comprising a frame which is constructed to allow flat packaging for transportation, and self-assembly on site.
 11. Apparatus according to claim 1 in which the creasing member is pivotally mounted with respect to the work surface, and in which the operator means causes the creasing member to operate such that the creasing member pivots with respect to the work area.
 12. Apparatus according to claim 1 and including depth indicator means for adjusting the amount of movement of the creasing member and thereby the depth of the creases made in the sheet metal.
 13. Apparatus according to claim 12 in which the depth adjuster means comprises a screw bolt.
 14. Apparatus according to claim 1 in which the work area has a receiving formation for receiving the creasing member as the creasing member creases the sheet metal, in which the receiving formation is a groove, and in which the groove is a V-groove. 15.-16. (canceled)
 17. Apparatus according to claim 1 in which the creasing member comprises a creasing blade, and in which the creasing blade extends at a right angle to a body part of the creasing member.
 18. (canceled)
 19. Apparatus according to claim 1 in which the operator means is a foot-operated operator means.
 20. Apparatus according to claim 19 in which the foot-operated operator means is a pneumatic foot-operated operator means.
 21. Apparatus according to claim 1 and including a stand on which the work area is mounted, in which the operator means is pivotally mounted about the stand, in which the operator means is spring biased to a rest position by a coil spring which extends between the operator means and the stand, and in which the stand comprises a base and an upstanding formation which upstands from the base and which supports the work area. 22.-24. (canceled)
 25. Apparatus according to claim 21 in which the base comprises a pair of legs which define a T-shape, and in which the upstanding formation is a post.
 26. (canceled)
 27. Apparatus according to claim 1 and including safety locking means for preventing unwanted operation of the creasing member.
 28. Apparatus according to claim 27 in which the safety locking means is a locking pin which extends into a hole in the creasing member, and in which the locking pin is spring biased to a position in which the locking pin is engaged in the hole in the creasing member, and in which the locking pin is holdable by holding means in a non-engaged position for operation of the creasing member.
 29. (canceled)
 30. Apparatus according to claim 28 in which the holding means is a rotatable pin arrangement. 